package itheima.reggie.controller;

import itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.UUID;

@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {
    @Value("${reggie.path}")
    private String bathPath;

    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){
      //file是临时文件，需要转存到其他位置，不然本次访问结束就会被清除
        log.info(file.toString());
        //原始文件名
        String originalFilename = file.getOriginalFilename();
        String suffix=originalFilename.substring(originalFilename.lastIndexOf("."));

        //使用uuid
        String fileName=UUID.randomUUID().toString().replaceAll("-","")+suffix;
        try {
            log.info(bathPath+fileName);
            file.transferTo(new File(bathPath+fileName));
        }catch (IOException e){
            e.printStackTrace();
        }

        return R.success(fileName);
    }

    /**
     * 文件下载
     * @param name
     * @param response
     */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
            //输入流读取文件内容
        try {
            FileInputStream fileInputStream=new FileInputStream(new File(bathPath+name));
            //输出流将输出流写回浏览器
            ServletOutputStream outputStream = response.getOutputStream();
            response.setContentType("image/jpeg");
            int len=0;
            byte[] bytes=new byte[1024];
            while ((len= fileInputStream.read(bytes))!=-1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }
            //关闭资源
            outputStream.close();
            fileInputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

    };
}
